If you want an english lesson however on slang theres so many more than kickass, dude
Theres
sick = Usually meaning that your not feeling well, or good (Like Kick ass)
sweet = Usually meaning that something is nice tasting or the same as (sick and kickass)
get stuffed = Get lost, i dont wanna see you, maybe saying something you dont wanna do eg.
parent: do your homework now
kid: get stuffed, i aint doing it